Astrochemistry dives into the evolution of the molecular universe, from the birth of the simplest molecules to the generation of building blocks for planets and possibly life. The universe holds an incredible evolving circular chemistry, where matter is processed and recycled by the birth, life, and death of stars and planets. An astonishing wealth of molecular species is found in space, encompassing the major functional groups in organic chemistry and important biological ones. The harsh conditions created by radiation, shock waves, cosmic rays, and more offer pathways to chemical evolution not possible on planets. Prebiotic molecules and compounds with characteristics relevant to the origin(s) of life on Earth and/or beyond may find their origin in space. This chapter follows the cyclic journey of interstellar matter, passing through the different astronomical environments and their chemical inventories, highlighting landmarks for astrobiology, and ending with future ventures into this fascinating field.